Construction method of vertical shaft longitudinal water-resisting layer
By introducing a longitudinal flexible water-stop ring into the vertical shaft, a continuous water-proof layer is formed, which solves the problem of water leakage in the vertical shaft, achieves efficient and reliable waterproofing, simplifies construction, and reduces project costs and construction period.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-02
- Publication Date
- 2026-03-10
AI Technical Summary
Existing vertical shafts suffer from water leakage problems in water-rich formations. Traditional construction methods result in poor waterproofing performance, long construction periods, high project costs, and complex processes. In particular, the double-wall thickness makes it difficult to control water seepage due to temperature cracks.
The system employs a longitudinal flexible waterstop structure. Through the hoisting, unfolding, fixing, and grouting sealing of the waterstop, a continuous waterproof layer is formed, blocking the seepage path, simplifying the construction process, and reducing project costs.
It achieves highly reliable waterproofing of a single-layer well wall, reduces the thickness of the well wall, simplifies the construction process, reduces costs, improves waterproofing stability and construction efficiency, and reduces the need for subsequent maintenance.
Smart Images
Figure CN121630451A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of waterproofing technology for mine shafts, specifically to a construction method for a longitudinal waterproof layer in a shaft. Background Technology
[0002] In the construction of mine shafts, especially in water-rich geological environments, building permanent shaft walls that are impermeable or have low permeability is a practical requirement in the design, construction, and use of shafts, and is also an important indicator for accepting whether a shaft is qualified.
[0003] Traditional vertical shaft structures and construction methods have many limitations. On the one hand, regarding waterproofing, the presence of construction joints and temperature cracks in the concrete allows groundwater to easily seep through the shaft walls, leading to leakage and severely impacting the normal use of the shaft and mine safety. For example, the earliest frozen shaft walls in my country used a single-layer design, constructed in sections from top to bottom. However, this sectioned construction resulted in ineffective water sealing at the joints between new and old concrete. Later, after the single-layer shaft wall was completed, an inner wall was added, called the inner shaft wall. Because the inner wall was continuously poured from bottom to top, and inter-wall grouting was used for waterproofing, it initially effectively prevented water seepage from the outer wall joints into the shaft. However, as the shaft depth and wall thickness increased, temperature cracks in the large volume of concrete in the inner wall became the main seepage channels, making waterproofing the shaft wall itself more difficult. The wall thickness, due to the double-layer structure, even exceeded 3 meters.
[0004] To address the problems of excessively thick double-layer well walls, high engineering costs, long construction periods, and persistent temperature cracks leading to water seepage, numerous studies have proposed waterproof single-layer well wall technologies. Waterproof single-layer well walls achieve seepage prevention through improved concrete impermeability. However, since single-layer well walls are constructed in sections from top to bottom, the issue of seepage at the joints between new and old concrete must be addressed. To this end, various joint waterproofing technologies have been proposed, such as joint grouting systems and joint grouting steel plates, achieving significant progress in single-layer well wall waterproofing. However, during the implementation of single-layer waterproof well walls, leakage at the joints is often due to various factors, requiring subsequent grouting treatment. Addressing these leaks can be challenging and time-consuming. Furthermore, the high quality requirements for concrete and the difficulty in controlling concrete cracks often hinder reliable waterproofing. Therefore, effectively improving the reliability of well wall waterproofing to solve the problems of poor waterproofing performance, long construction periods, high costs, and complex construction processes in existing technologies has significant practical importance and an urgent market demand. Summary of the Invention
[0005] In view of the current situation where most vertical shafts still leak water after the completion of the shaft wall construction, even after grouting and water plugging, this invention aims to provide a construction method for a longitudinal waterproof layer in vertical shafts. Its core objective is to fundamentally block the groundwater seepage path by introducing a continuous and reliable longitudinal flexible waterproof layer, thereby achieving highly reliable waterproofing of a single-layer shaft wall, and effectively simplifying the construction process, reducing project costs and construction period.
[0006] To solve the above-mentioned technical problems, the technical solution provided by the present invention is: a construction method for a longitudinal water-resistant layer in a vertical shaft, applicable to the segmented downward construction of the shaft, including initial segment height construction and subsequent segment height construction, specifically including the following steps: S1. Preparation and molding of waterstop ring: Polymer material plates are made according to the rough diameter and height of the excavation section of the well shaft. They are then welded on the ground into a cylindrical waterstop ring. The inner diameter of the cylindrical waterstop ring is adapted to the well shaft cutting edge template and the outer diameter of the well wall to ensure that the waterstop ring can surround the well wall. During welding, an lap hot melt process is used to form a sealed weld. The waterstop ring is pressed and rolled into a cylinder for easy transportation. S2. Waterstop ring hoisting and unfolding: After excavating a section of high ground, lower the ring-shaped cutting edge template, hoist the rolled-up cylindrical waterstop ring to the underground working face, and use the hoisting equipment to operate synchronously so that the waterstop ring unfolds into a cylindrical shape above the working face, and move the construction equipment into the waterstop ring; S3. Lowering the waterstop ring: Lower the waterstop ring so that its lower edge is inserted into the gap between the cutting foot template and the well wall and is flush with the lower edge of the cutting foot template; use filling material to seal the channel between the lower edge of the waterstop ring and the working surface to achieve the purpose of sealing the bottom when grouting between the well wall and the waterstop ring. S4. Installation of well wall support structure: Vertical steel bars are arranged at intervals to form a ring skeleton. The lower end of the vertical steel bars is fixed to the cutting foot template, and the upper end of the vertical steel bars is connected to the previous section of vertical steel bars through a connecting sleeve. Then, a ring of circumferential steel bars is tied to the vertical steel bars to temporarily support the water stop ring and keep it basically upright. After the water stop ring is installed in place, the remaining vertical steel bars and circumferential steel bars are tied. S5. Fixing and connecting the upper part of the waterstop ring: Fix the upper part of the waterstop ring according to the construction section height type; for the initial section height where the waterstop ring is used, the upper part of the waterstop ring is fixed to the well wall by anchor bolts or independent supports; for subsequent sections, the upper part of the waterstop ring is sealed and connected to the bottom of the previous section of the waterstop ring by bonding and welding to ensure the continuity of the overlap. S6. Grouting and Concrete Pouring: Inject quick-setting grout into the grouting pipe reserved on the waterstop ring to reinforce the lower edge plate of the waterstop ring; after binding the remaining steel bars, remove the upper section of the formwork and combine it with the cutting edge formwork to carry out concrete pouring and grouting operations, and complete the construction of a section of the well wall. S7. Construction Cycle Progression: Excavate the new section height downwards. After the concrete strength reaches the demolding requirements, lower the cutting edge formwork and repeat the above steps to form a well wall structure with a continuous longitudinal water-proof layer, forming a water-impermeable well cylinder.
[0007] As a preferred embodiment of this application, in step S1, the waterstop ring is welded on the ground. Its material is HDPE with a thickness of 1-3mm. The circumference is determined by calculating the outer diameter of the lower edge of the cutting edge template plus the tolerance value or the outer diameter of the well wall plus the tolerance value. An overlap length is reserved for the first and last overlaps. The overlap part is hot-melted by a pressure roller welding machine to form a vertical weld to ensure sealing. In addition, multiple grouting ports for installing grouting pipes are reserved at equal intervals at the lower part of the waterstop ring.
[0008] As a preferred embodiment of this application, step S1 further includes preparing a hanging plate: cutting an HDPE hanging plate with a width of 150-250mm, the length of which is the same as that of the waterstop ring, and opening mounting holes at equal intervals on the upper edge of the hanging plate for subsequent hanging connection; the lower edge of the hanging plate is welded to the upper part of the waterstop ring at a position 0.5-1.0m from the upper edge.
[0009] As a preferred embodiment of this application, in step S2, the lifting equipment includes multiple electric hoists, which are evenly arranged at the bottom of the lifting platform. The waterstop ring is unfolded by lifting. During the unfolding process, the construction excavator moves into the interior from the bottom of the waterstop ring and assembles scaffolding on the working surface. The scaffolding is reliably connected to the cutting edge template to prevent overturning.
[0010] As a preferred embodiment of this application, in step S3, the filling material is sand, which is used to achieve sealing by filling the channel between the lower edge of the waterstop ring and the working surface.
[0011] As a preferred embodiment of this application, in S4, the vertical reinforcing bars are arranged in a ring at intervals of 800-1500mm, and the lower ends of the vertical reinforcing bars are inserted into the ring grooves at the upper end of the cutting edge template; the ring reinforcing bars are tied in multiple layers, and the waterstop ring can be suspended from the mounting holes on the hanging plate to the ring reinforcing bars to finely adjust the height of the upper edge of the waterstop ring.
[0012] As a preferred embodiment of this application, the overlap length between the bottom of the waterstop ring and the bottom of the previous waterstop ring is 100-250mm. When overlapping, strong double-sided adhesive is first pasted on the bottom of the previous waterstop ring to make the overlapping section of the upper and lower waterstop rings fit tightly, and then the overlap seam is squeezed and welded.
[0013] As a preferred embodiment of this application, in step S6, the concrete pouring and grouting operations are carried out in stages: first, a quick-setting grout of 0.5 to 1m height is poured into the space between the waterstop ring and the well wall to fix the lower end of the waterstop ring. After the grout has solidified, the well wall concrete between the formwork and the waterstop ring is poured to a height of 0.5 to 1m. Then, grouting and concrete pouring can be carried out on both sides of the waterstop ring at the same time. However, the height difference between the liquid level inside and outside the waterstop ring must be kept within 300mm. The joint between the upper and lower sections must be filled with grout first and then sealed before the remaining concrete is poured.
[0014] Compared with the prior art, the advantages of this application are: 1. Construct a continuous and reliable longitudinal waterproof layer to block seepage channels at the source: This method forms a continuous physical waterproof barrier along the longitudinal direction of the well shaft by setting an integral polymer waterproof ring structure. This can effectively seal traditional seepage paths such as construction joints and concrete temperature cracks, significantly improving the overall waterproof reliability of the well wall and avoiding reliance on single concrete self-waterproofing or local joint treatment.
[0015] 2. Achieve reliable waterproofing of single-layer well walls and significantly optimize structural thickness and material costs: Since the waterproofing function is mainly undertaken by the water-stop ring, the well wall concrete focuses more on structural load-bearing. Therefore, it can be designed as a single-layer well wall, effectively reducing the thickness of the well wall, saving concrete usage, reducing project costs, and avoiding the structural complexity and construction difficulty brought about by double-layer well walls.
[0016] 3. The construction process integrates waterproofing and structural construction, reducing post-construction procedures: The installation of the waterproof layer is carried out simultaneously with the pouring of the well wall concrete, and the grouting and sealing of key parts are completed during the construction phase. This avoids the grouting operations between or behind the wall that are common in traditional methods, which simplifies the process and saves subsequent grouting costs and time.
[0017] 4. Flexible waterproof layer adapts to well deformation, improving long-term waterproof stability: The flexible water-stop material used can adapt to minor deformations during well construction and operation, reducing the risk of cracking caused by concrete shrinkage or ground displacement, thus providing a more durable waterproof effect and reducing maintenance needs and drainage costs during use.
[0018] 5. Modular construction facilitates quality control and accelerates project progress: Waterstop rings can be prefabricated on the ground and rolled up for transportation. On-site hoisting, unfolding, and connection operations are highly standardized, which helps ensure the consistency and efficiency of construction quality. It is suitable for the construction mode of advancing the well shaft section by section, shortening the overall construction period. Attached Figure Description
[0019] Figure 1 This is a diagram showing the excavation and support status of the shaft before the implementation of the longitudinal water-resistant layer in this application. Figure 2This is a schematic diagram of the hoisting and installation of the water-stop ring inside the shaft of this application; Figure 3 This is a schematic diagram of the lifting and deployment of the water-stop ring inside the shaft and the arrangement of the excavator equipment in this application; Figure 4 This is a schematic diagram of the fixing of the water-stop ring inside the shaft of the vertical shaft in this application; Figure 5 This is a schematic diagram of the installation of the water-stop ring inside the shaft of the vertical shaft in this application; Figure 6 This is a schematic diagram of the grouting reinforcement at the cutting edge template of this application; Figure 7 This is a schematic diagram of the first layer of concrete and grouting in this application; Figure 8 This is a schematic diagram of the second layer of concrete and grouting in this application; Figure 9 This is a partially enlarged schematic diagram of the concrete and grouting in this application; Figure 10 This is a partially enlarged schematic diagram of the cutting edge template of this application.
[0020] As shown in the figure: 1. Waterstop ring, 2. Cutting edge formwork, 3. Vertical reinforcement, 4. Formwork, 5. Grouting pipe, 6. Electric hoist, 7. Hanging platform, 8. Scaffolding. Detailed Implementation
[0021] The present invention will now be described in further detail with reference to the accompanying drawings.
[0022] The specific embodiments of the present invention will be further described below with reference to the accompanying drawings. Identical components are indicated by the same reference numerals.
[0023] It should be noted that the terms “front,” “back,” “left,” “right,” “up,” and “down” used in the following description refer to the directions shown in the attached diagram, while the terms “inside” and “outside” refer to the directions toward or away from the geometric center of a specific component, respectively.
[0024] The invention will now be described in further detail with reference to the accompanying drawings. This invention provides a method for constructing a longitudinal water-resistant layer in a vertical shaft, applicable to the segmented downward construction of mine shafts in water-rich strata. By setting up a continuous longitudinal water-resistant layer, it effectively prevents formation water infiltration and improves the waterproof reliability of the shaft wall. The method mainly includes two stages: initial high-level construction and subsequent high-level construction, forming an overall water-resistant system through cyclical advancement. The following description, in conjunction with the accompanying drawings... Figure 1-5 The implementation methods of each step are described in detail with specific examples.
[0025] S1. Preparation and molding of the waterstop ring This step aims to prepare a cylindrical waterstop ring for forming a longitudinal waterproof layer, ensuring its dimensional accuracy and good sealing performance. Specific implementation includes: First, high-strength, corrosion-resistant high-density polyethylene (HDPE) material is selected as the base material for the waterstop ring 1, with a preferred thickness of 1-3mm (2mm in this embodiment). Based on the wellbore design dimensions, the outer diameter of the lower edge of the cutting edge template 2 is calculated, with an additional 10mm tolerance, to determine the circumference of the waterstop ring 1. For example, if the outer diameter of the lower edge of the cutting edge template 2 is D, the formula for calculating the unfolded length of the waterstop ring 1 is: π × (D + 10mm) + 100mm (where 100mm is the overlap allowance). After the HDPE board is fabricated according to specifications, the ends are overlapped by 100mm using a hot-melt lap welding process, and a vertical weld is formed using a pressure roller welder to ensure weld sealing. After welding, the waterstop ring 1 is cylindrical, with an inner diameter slightly larger than the outer diameter of the cutting edge template 2 (e.g., 10mm larger) to surround the well wall. During transport downhole, the waterstop ring 1 can be folded and rolled into a cylinder.
[0026] To facilitate transport to the well, the welded cylindrical waterstop ring 1 can be stacked and rolled into a compact cylinder and temporarily fixed with straps.
[0027] In addition, key accessories need to be pre-installed on the waterstop ring 1: Grouting ports: At the bottom of the waterstop ring 1, within a height range of about 300-500mm from its lower edge, four grouting ports are opened around the perimeter, and threaded grouting pipe joints (such as DN25) are pre-embedded for subsequent installation of grouting pipe 5.
[0028] Hanging plate: To improve the ease of hoisting and fixing the waterstop ring 1 underground, a specially prepared hanging plate is required. Cut a strip of HDPE board with a width of 150-250mm (200mm in this embodiment) and a length equal to the height of the waterstop ring 1 as the hanging plate. About 100mm below the upper edge of the hanging plate, make 20mm diameter mounting holes at equal intervals (e.g., one per meter) along the length. Then, firmly connect the lower edge of the hanging plate to the upper part of the waterstop ring 1 by hot-melt welding, with the welding position approximately 0.6-1.0m (0.8m in this embodiment) from the upper edge of the waterstop ring 1.
[0029] S2, Installation and deployment of the waterstop ring The purpose of this step is to safely hoist the curled waterstop ring down into the well and unfold it into a cylindrical shape, creating conditions for subsequent installation. The specific operation is as follows: Reference Appendix Figure 1 -Appendix Figure 2After the shaft is excavated to a certain height (e.g., 4m), the annular cutting edge template 2 is lowered to the working face. The cutting edge template 2 is assembled from multiple arc-shaped templates into a complete ring, with a gap between its lower edge and the shaft wall. The waterstop ring 1, rolled into a cylinder, is then lifted to the working face using hoisting equipment. The hoisting equipment includes multiple electric hoists 6 (e.g., 4-6), evenly distributed at the bottom of the hoisting platform 7, and the waterstop ring 1 is lowered smoothly through synchronous control. During hoisting, the hooks of the electric hoists 6 are attached to the mounting holes on the hoisting plate.
[0030] After the waterstop ring 1 is hoisted above the working surface, it is slowly unfolded into a cylindrical shape. (See attached image) Figure 3 As shown, during the deployment process, construction equipment (such as excavators) is moved inside from the bottom of the waterstop ring 1 to avoid interference. Simultaneously, scaffolding 8 is assembled on the working surface, and scaffolding 8 is reliably connected to the cutting edge template 2 via bolts or welding to prevent overturning. After deployment, the waterstop ring 1 is positioned outside the cutting edge template 2, initially surrounding the well wall.
[0031] Continue to refer to the appendix Figure 4 -Appendix Figure 6 The following steps will be taken: S3, Lowering the waterstop ring and initial sealing After the waterstop ring 1 is unfolded, it needs to be lowered to the design elevation and the bottom should be initially sealed. This is the first step in forming an effective waterproof layer. Implementation details include: The waterstop ring 1 is slowly and synchronously lowered using a lifting device, sliding down along the outside of the cutting edge template 2 until its lower edge is embedded in the annular gap between the lower edge of the cutting edge template 2 and the well wall. The lower edge of the waterstop ring 1 should be aligned with the lower edge of the cutting edge template 2 as much as possible. This process requires careful adjustment to ensure that the waterstop ring 1 is lowered evenly around its circumference, avoiding twisting or localized folding.
[0032] After the lower edge of the waterstop ring 1 is in place, immediately seal the gap between its lower edge and the working face of the wellbore with filling material (usually dry, clean medium-coarse sand or sandbags). The filling should be dense and continuous to form an effective temporary "bottom seal," preventing a large amount of grout from flowing out of the bottom during subsequent grouting and creating conditions for subsequent grouting reinforcement. After filling is completed, the bottom sealing effect can be preliminarily checked.
[0033] S4. Installation of wellbore support structure: To facilitate the positioning and installation of the waterstop ring 1, this step employs a phased approach to construct the reinforcing steel frame. First, the initial batch of vertical reinforcing bars 3 are laid out at intervals, and the first layer of circumferential reinforcing bars is tied, forming a preliminary frame for temporary support and leveling of the waterstop ring 1. After the waterstop ring 1 is in place, all remaining reinforcing bars are then added to form the complete frame. The vertical reinforcing bars 3 are spaced 800-1500mm apart (956mm in this example), with their lower ends fixed to the annular groove of the cutting edge template 2, and their upper ends connected to the upper layer of reinforcing bars via threaded sleeves. The waterstop ring 1 is suspended from the circumferential reinforcing bars by a hanging plate for fine-tuning.
[0034] S5, Upper part of the waterstop ring is fixed and connected Ensuring a reliable and sealed connection between the upper part of the waterstop ring 1 and the well wall (initial section) or the waterstop ring that has been constructed in the previous section (subsequent section) is crucial to ensuring the continuity of the longitudinal waterproof layer.
[0035] For the initial construction section height: the upper part of the waterstop ring 1 (mainly through the hanging plate) needs to be temporarily fixed to the well wall. Short anchor rods can be driven into the stable rock layer to prevent the upper end of the waterstop ring 1 from sinking or shifting.
[0036] For subsequent high-level construction sections: This step is crucial. First, the exposed joint area at the bottom of the waterstop ring 1 after the construction of the previous high-level well wall needs to be cleaned to ensure its surface is clean and free of debris. Then, a ring of high-strength, water-resistant double-sided tape or a special adhesive (such as modified epoxy resin) should be pre-applied to the outer bottom of the previous waterstop ring 1 (i.e., the area overlapping with the current waterstop ring 1). Subsequently, the height of the current waterstop ring 1 is precisely adjusted using lifting equipment so that its upper edge overlaps with the bottom of the previous waterstop ring 1 as designed, with an overlap length of not less than 100mm (200mm in this embodiment). This allows the overlapping area to initially adhere tightly under the action of the adhesive. To further ensure a flawless result, after the initial bonding of the overlap joint is completed, the overlap joint should be immediately pressed and welded using a compression welding machine to form a strong, sealed weld. The welding must be continuous and full, and the sealing quality should be checked after welding.
[0037] S6. Grouting and Concrete Pouring Reference Appendix Figure 7 -Appendix Figure 10 This step is a key link in integrating the waterproof layer reinforcement and well wall structure formation. Through phased and controlled grouting and concrete pouring, the waterstop ring 1 is ensured to be firmly in place and to form qualified well wall concrete.
[0038] Bottom grouting reinforcement: Through the grouting pipe 5 pre-embedded above the waterstop ring 1, inject quick-setting grout (such as cement paste with added quick-setting agent) into the bottom of the annular cavity between the waterstop ring 1 and the well wall. The grouting height is approximately 0.5-1.0 meters. The purpose is to solidify the lower edge of the waterstop ring 1 with the well wall, forming a solid "base" to prevent the bottom of the waterstop ring 1 from shifting during subsequent concrete pouring. The next step can only be carried out after this portion of the grout has initially solidified and reached a certain strength.
[0039] The process of segmented concrete pouring and simultaneous grouting requires precise control.
[0040] First, pour concrete for the well wall between the vertical formwork 4 (i.e., the inner formwork) and the waterstop ring 1 to a height of approximately 0.5-1.0 meters. This is the first layer of concrete pouring to fix the lower end of the waterstop ring 1.
[0041] After confirming that the grout has solidified, pour the well wall concrete between the formwork 4 and the waterstop ring 1 to a height of 0.5~1m. Then, grouting and concrete pouring can be carried out on both sides of the waterstop ring 1 at the same time.
[0042] Key control points: During concrete pouring and simultaneous grouting, the difference in liquid level between the inner and outer sides of the waterstop ring 1 (i.e., the concrete side of the well wall and the grouting side behind it) must be strictly controlled. It is recommended that the difference in liquid level should not exceed 300mm to prevent excessive deformation, displacement, or even damage to the flexible waterstop ring 1 due to pressure imbalance. The liquid level on both sides should be closely monitored during construction, and dynamic balance should be achieved by adjusting the concrete pouring speed and grouting speed.
[0043] The treatment of the joint between the upper and lower sections should be extra careful: ensure that the cavity behind the wall at the joint is fully filled and sealed with grout before pouring concrete to cover the joint area to avoid the formation of seepage channels.
[0044] Concrete pouring must comply with specifications and be fully vibrated to ensure compaction. However, care must be taken to ensure that the vibrator does not directly touch the waterstop ring 1 to avoid damage.
[0045] S7, Construction Cycle Progress This step achieves continuous wellbore construction by repeating the above operations. Specifically: After the concrete in this section reaches the required strength for demolding, remove the cutting edge formwork 2 and the vertical formwork 4. Excavate downwards to a new section height, repeating steps S1-S6, so that the waterstop ring 1 is connected segment by segment to form a continuous longitudinal waterproof layer.
[0046] This invention, through the above steps, achieves efficient waterproofing construction of vertical shafts, offering advantages such as short construction period, low cost, and high waterproofing reliability. The above embodiments are for illustrative purposes only and are not intended to limit the scope of the invention; those skilled in the art can make adjustments to the details within the scope of the claims.
[0047] The present invention and its embodiments have been described above. This description is not restrictive, and the accompanying drawings are only one embodiment of the present invention; the actual structure is not limited thereto. In conclusion, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the spirit of the invention, such designs should fall within the protection scope of the present invention.
Claims
1. A construction method of a vertical shaft wellbore longitudinal aquifuge, suitable for segmented descending construction of a wellbore, including initial segment height construction and subsequent segment height construction, characterized in that, Specifically comprising the following steps: S1, water stop ring preparation and forming: according to the wellbore excavation path and the excavation section height, a polymer material plate is made, which is welded into a cylindrical structure of the water stop ring (1) on the ground. The inner diameter of the cylindrical structure of the water stop ring (1) is adapted to the wellbore blade foot template (2) and the well wall outer diameter, so as to ensure that the water stop ring (1) can surround the well wall. When welding, lap hot melting process is used to form a sealed weld. The water stop ring (1) is pressed, folded and curled into a cylinder for convenient transportation; S2, water stop ring hoisting and unfolding: after excavating a section, the annular blade foot template (2) is lowered, the curled water stop ring (1) in the form of a cylinder is hoisted to the working face underground, and the hoisting equipment is operated synchronously to unfold the water stop ring (1) into a cylindrical shape above the working face, and the construction equipment is moved into the water stop ring (1); S3, water stop ring lowering: the water stop ring (1) is lowered so that its lower edge is inserted into the gap between the blade foot template (2) and the well wall, and is flush with the lower edge of the blade foot template (2); a filling material is used to block the channel between the lower edge of the water stop ring (1) and the working face, achieving the purpose of sealing the bottom when grouting between the well wall and the water stop ring; S4, well wall support structure installation: part of the vertical steel bars (3) are arranged at intervals to form a ring-shaped framework. The lower end of the vertical steel bars (3) is fixed to the blade foot template (2), and the upper end of the vertical steel bars (3) is connected to the vertical steel bars (3) of the previous section through a connecting sleeve. Then a ring of circumferential steel bars is tied on the vertical steel bars (3) for temporarily supporting the water stop ring (1) to keep it basically upright. After the water stop ring (1) is installed in place, the remaining vertical steel bars (3) and circumferential steel bars are tied; S5, upper part of water stop ring fixing and connection: according to the type of the construction section, the upper part of the water stop ring (1) is fixed; for the initial use of the water stop ring (1), the upper part of the water stop ring (1) is fixed to the well wall by anchor rods or independent support; for subsequent section heights, the upper part of the water stop ring (1) is connected to the bottom of the water stop ring (1) of the previous section by bonding and welding to ensure the continuity of the lap joint; S6, grouting and concrete pouring: fast-setting slurry is poured from the grouting pipe (5) reserved on the water stop ring (1) to reinforce the lower edge plate of the water stop ring (1); after tying the remaining steel bars, the formwork (4) of the previous section is removed and combined with the blade foot template (2) for concrete pouring and grouting operation, completing the construction of the well wall of one section; S7, construction cycle advancement: a new section is excavated, the blade foot template (2) is lowered after the concrete strength reaches the demolding requirement, and the above steps are repeated to form a well wall structure containing a continuous longitudinal waterproof layer, forming a non-water permeable wellbore.
2. The method of constructing a vertical shaft longitudinal aquifuge according to claim 1, wherein, In step S1, the water stop ring (1) is welded on the ground. The material is HDPE, the thickness is 1-3 mm, the circumference is determined by calculating the outer diameter of the lower edge of the blade foot template (2) plus the tolerance value or the outer diameter of the well wall plus the tolerance value, and the lap length is reserved for the lap joint of the head and tail. The lap joint part is welded by a pressure roller welding machine to form a vertical weld to ensure sealing. The lower part of the water stop ring (1) is provided with multiple grouting openings for installing grouting pipes (5) at equal intervals.
3. The method of constructing a vertical shaft longitudinal aquifuge according to claim 2, wherein, In step S1, the hanging plate is also prepared: the HDPE hanging plate with a width of 150-250 mm is cut to the same length as the water stop ring (1), and mounting holes are evenly opened on the upper edge of the hanging plate for subsequent hanging connection; the lower edge of the hanging plate is welded to the upper part of the water stop ring (1) at a position 0.5-1.0 m away from the upper edge.
4. The method of constructing a longitudinal aquifuge for a mine shaft wellbore of claim 1, wherein, In step S2, the hoisting equipment includes a plurality of electric hoists (6) arranged uniformly at the bottom of the hoist tray (7) to expand the water stop ring (1) by hoisting; during the expansion process, the construction excavator is moved into the interior from the bottom of the water stop ring (1), and the scaffold (8) is assembled on the working face, and the scaffold (8) is reliably connected with the blade foot formwork (2) to prevent overturning.
5. The method of constructing a longitudinal aquifuge for a mine shaft wellbore as defined in claim 1, wherein, In step S3, the filling material is sand, which is used to realize sealing by filling the channel between the lower edge of the water stop ring (1) and the working face.
6. The method of constructing a vertical shaft water-resistive barrier according to claim 3, wherein, In S4, the vertical steel bars (3) are arranged in a ring shape at intervals of 800-1500 mm, and the lower ends of the vertical steel bars (3) are inserted into the annular groove at the upper end of the blade foot formwork (2); the ring-shaped steel bars are bound in multiple layers, and the water stop ring (1) can be hung on the ring-shaped steel bars through the mounting holes on the hanging plate to fine-tune the height of the upper edge of the water stop ring (1).
7. The method of constructing a vertical shaft water-resistive barrier according to claim 4, wherein, The water stop ring (1) is overlapped with the bottom of the previous water stop ring (1) by a length of 100-250 mm, and when overlapping, strong double-sided adhesive tape is first pasted on the bottom of the previous water stop ring (1) to make the overlapping sections of the upper and lower water stop rings (1) fit tightly, and then the overlapping joint is extrusion welded.
8. The method of constructing a vertical shaft longitudinal aquifuge of claim 4, wherein, In step S6, the concrete pouring and grouting operations are implemented in stages: first, the space between the water stop ring (1) and the shaft wall is grouted with 0.5~1m high quick-setting grouting material to fix the lower end of the water stop ring (1), and after the grouting material is solidified, the shaft wall concrete between the formwork (4) and the water stop ring (1) is poured to a height of 0.5~1m, and then the water stop ring (1) on both sides can be grouted and poured with concrete at the same time, but the liquid level difference between the inside and outside of the water stop ring (1) should be kept within 300 mm, and the high joint position of the upper and lower sections should be sealed after the grouting material is filled, and then the remaining concrete is poured.